AA 5510 then DL 1222 at Atlanta
Washington National → Atlanta → San Antonio
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
20:30DL 1222 to San Antonio leaves the gate
21 h 07 apart on the timetable, overnight
DL 1222 leaves 21 h 07 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.